Three-jet event
= Three-jet event
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In <inclusive electron-positron annihilation into hadrons>, hard gluon radiation produces a quark, an antiquark and a gluon, giving three resolved <particle jets>. Observation of such events at PETRA in 1979 provided direct evidence for <gluons>. The institutional account is https://www.desy.de/news/news_search/index_eng.html?openDirectAnchor=1643&printversion=1 .